fix(vuepress-theme-reco): ssr-related issues

Author: stevapple

packages/vuepress-theme-reco/components/Footer.vue

@@ -13,8 +13,8 @@
       <a>
         <span v-if="$themeConfig.author || $site.title">{{ $themeConfig.author || $site.title }}</span>
         &nbsp;&nbsp;
-        <span v-if="$themeConfig.startYear && $themeConfig.startYear != year">{{ $themeConfig.startYear }} - </span>
-        {{ year }}
+        <span v-if="$themeConfig.startYear && $themeConfig.startYear != (new Date().getFullYear())">{{ $themeConfig.startYear }} - </span>
+        {{ new Date().getFullYear() }}
       </a>
     </span>
     <span v-show="$themeConfig.valineConfig !== undefined">
@@ -35,11 +35,6 @@ export default {
     return {
       version
     }
-  },
-  computed: {
-    year () {
-      return new Date().getFullYear()
-    }
   }
 }
 </script>

packages/vuepress-theme-reco/components/Navbar.vue

@@ -22,7 +22,7 @@
         'max-width': linksWrapMaxWidth + 'px'
       } : {}">
 
-      <Mode v-show="$themeConfig.modePicker !== false" />
+      <Mode v-if="$themeConfig.modePicker !== false" />
       <AlgoliaSearchBox
         v-if="isAlgoliaSearch"
         :options="algolia"/>